Piston-packing



(N0 ModeL-j G. H. MEADBR.

PISTON PACKING.

No. 402,267. Patnted Apr. 30,1889.

INVEN TEIR 4 Q71. war

, packing-ring.

UNITED STATES PATENT OFFICE.

GEORGE I'I. MEADER, OF BOSTON, MASSACHUSETTS.

PISTON-PACKING.

SPECIFICATION forming part of Letters Patent No. 402,267, dated April30, 1889.

Application filed October 25, 1888. Serial No. 289,125. (No model.)

To aZZ whom it may concern.-

Be it known that I, GEORGE H. MEADER, of Boston, in the county ofSuffolk and State of Massachusetts, a citizen of the United States, haveinvented a new and useful Improvement in Piston-Packing, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying; drawings, forming a part of this specification, inexplaining its nature.

The invention relates to a packing-ring for pistons, which comprises,essentially, a cleft expansible ring which is practically T-shaped incross-section and which is held between a bull-ring or other holdingdevice made in two parts and shaped upon their opposing edges to form achannel to receive the narrow in wardly-extending section or web of thepacking-ring, and a steam-expanding recess upon each side of its head orrim. A T packingring of this construction and so held is adapted to beexpanded upon each movement of the piston by the action of the steamagainst one side of the head or rim of the packingring, and then byitsaction upon the opposite side of the headof the ring, according as thepiston is moved in the cylinder.

The invention further relates to various details of organization andconstruction, all of which will hereinafter be described,

In the drawings, Figure 1 is a view in longitudinal section of acylinder and piston with my packing-ring attached thereto. Fig. 2 is aView in elevation of one section of the bull-ring. Fig. 3 is a view inelevation of the Fig. 4 is a view in elevation of the other section ofthe bull-ring. Fig. 5 is a view illustrating the relation of thepackingring to the two sections of the bull-ring. Fig. 6 is a View inplan of one section of the bullring. Fig. 7 is a view in plan of a partof the packing-ring. Fig. Sis a view in plan of a part of the othersection of the bull-ring from that shown in Fig. 6. Fig. 9 representsthe application of the packing to a solid-headed piston. Fig. 10 is anenlarged sectionalview.

A represents the bull-ring or support for the packing-ring B. Thisbull-ring or support is represented in Figs. 1, 5, and 10 as made in twoparts, a a. The part a has the section or sleeve c of less diameter thanthe main part of the section a. It also has at the end of the sleeve thewall a, which extends outward to a narrow annular surface, a*. From thisnarrow annular surface there extends an inclined surface orwall, a to orvery nearly to the outer edge of the bull-ring.

The section a of the bull-ring or support for the piston-packing ringhas an annular recess, a, at one end, of a size to fit upon the sleeve aof the section a; and it also has upon its inner side the wall of, thenarrow annular surface a and the inclined wall a". There is formed uponor attached to the sleeve a a key-block, C, which serves two purposes,first, by entering a hole, 0, in the wall a of the section a it preventsthe section from being turned on the sleeve a and it also serves, aswill hereinafter appear, to hold the pistonpacking ring from turningupon the bull-ring or other support. There is formed upon the section aof the ring, on a line with the key, an extension, e, and upon aposition opposite the said extension 6 another extension e. Theseextensions are for use in connection with the packing-ring.

The packing-ring B is represented in Figs. 1, 3, 5, 9, and 10. It isformed with the inwardly-extending section or web b, of practicallyuniform width, and has the head or rim (1, which extends from each sideof the web, forming a somewhat wide outer bearing-sun face, 17 and uponeach side of the web b an-.

inclined or tapering surface, 17 which extends from each side outwardlyto the edge of the head or rim. In other words, it has practically thesame cross-section as the crosssection of the holding-recess D, betweenthe .two sections a a, of the bull-ring orholding ring or support whentogether, with the exception that the outer part of said recess is.

somewhat wider than the width of the rim or head, so that when thepacking-ring is in and sections of the head or rim are removed from theweb of suificient extent to allow the flanges to extend between the twoabutments or pieces e e, as represented in Fig. 5, these sections actingas a packing to the joint in the ring.

In Fig. 9 I have represented the packing ring as applied to asolid-headed piston, the piston being made in two parts or sections, oneof which, the section F, is formed to correspond to the section CL ofthe bull-ring so far as the parts receiving the packing-ring areconcerned, and the part F has its packing-ring-holding section or partof substantially the shape of the section a of the bullring abovedescribed. These corresponding parts, however, instead of being formedupon the bull-ring, which is itself secured to the spider of the piston,as represented in Fig. l, are formed upon sections of the piston itself.This enables the packing-ring to be placed upon a somewhat narrow orthin piston.

It will be seen that the end of the sleeve a of the part (t of thebull-ring comes in contact with the wall at the end of the annularrecess a. of the part a, and that this regulates the width of thechannel or recess of the ring which receives the web of the packingring.This channel or recess must be of sufficient width to permit or allowthe web of the pack ing-ring to move freely therein.

It will be observed that there is upon each side of the'head or rim ofthe packing-ring a space or recess, h h, to which the steam has access,alternately, from the end of the cylinder supplied with it, the steamentering said recess through a narrow passage or channel between thewallof the piston and that of the cylinder, and that this serves toexpand or move the ring outwardly from the bull-ring or support to bringits head or face into contact with the wall of the cylinder and tomaintain it there duringthe reciprocation of the piston, first, by thesteam acting from one end of the piston, and upon the reversed movementof the piston by the steam acting from the other end. The piston is soplaced or located in the cylinder that the cheeks and joint of thepacking-ring are against or upon the bottom of the cylinder.

The advantages of the construction arise from its simplicity andcheapness, and from the fact that the packing-ring is double-acting,which permits it to be used upon practically all kinds of engines havingreciprocating pistons.

I am aware of the patent to N. Hunt, N 0. 68,989, dated September 17,1867, for enginepistons, but the same does not contain the essentialelements of my invention.

Having thus fully described my invention, I claim and desire to secureby Letters Patent of the United States- 1. The combination, in apiston-packing, of a section of a ring or holder having the sleeve (1the wall a and the inclined surface a, with the removable section havingthe annular recess a, the wall (1 and the inclined section a, and thecleft or divided packing-ring B, having the flange b and head or rim 1),extending from both sides of the flange and contained or held betweenthe said two sections, substantially as described.

2. The combination of the section at, having the sleeve a the key 0,extending from the sleeve, and the section a, having the recess a, withthe packing-ring B, having the flange b and the head or rim 1), and therecess 0 in the flange to receive the key, substantially as described.

3. The combination of the sectiona of the bull-ring or support havingthcprojection or check 6, the section a of the bull-ring or support havingthe projection or cheek e, the two sections being shaped to provide,when together, the packing-ring-holding space D, with said packing-ringB, the head or rim of which is cut away on each side of the opening toprovide recesses, into which said cheeks or projections e e enter,substantially as described.

GEO. ll. MEADER.

\Vitnesses:

F. F. RAYMOND, M, J. M. DOLAN.

